Sunanda Pushkar, wife of Union minister of state for human resources Shashi Tharoor, was "physically weak" and starvation made matters worse triggering a "mild cardiac arrest", police sources said on Monday.

Tharoor had recorded his statement before a sub divisional magistrate on Sunday and is understood to have narrated the events prior to the death of his wife in five-star hotel suite in New Delhi during the 50 minutes.

Tharoor was questioned about his relationship with his wife as well as the injury marks on her body by the SDM, police sources told HT.

"Tharoor was also asked about Sunanda's possible dependence on Alprax (an anti-depressant drug)," said a police officer on conditions of anonymity.

"Her stomach wash reflected she had had no solids on day of death," he added.

Sources also said that the All India Institute of Medical Science (AIIMS) has submitted the autopsy report to the SDM and they will proceed as per directions.

"For us, its like a normal case of death following marital discord," police sources added.

The SDM also asked the officers investigating the case to provide Sunanda's call record details between 3-7pm on the day she died, police sources said.

Along with Tharoor, Sunanda's brother Rajesh and journalist Nalini Singh had also recorded their statements before SDM Alok Sharma.

A panel of doctors from AIIMS, who had conducted the post-mortem examination, had said on Saturday that Sunanda died an "unnatural, sudden death".

"There were certain injury marks on the body of Sunanda Pushkar, but the nature of these cannot be revealed," said Dr Sudhir Kumar Gupta, head of the forensic department at AIIMS.

The physical injuries on Sunanda's body may or may not be related to her death, added Dr Gupta.

The minister will go to Haridwar later in the day to immerse the ashes of his wife, who was cremated on Saturday.

Tharoor had written to Union home minister Sushilkumar Shinde offering full cooperation in the probe before he recorded his statement.

In his letter to Shinde, Tharoor said he was "horrified" to see the "reckless speculation rampant" in the media. He said the relevant authorities should be asked to expedite the investigation and come to a rapid conclusion so that the truth emerges at the earliest.